37 research outputs found
Hyperfine splitting in ordinary and muonic hydrogen
We provide an accurate evaluation of the two-photon exchange correction to
the hyperfine splitting of S energy levels in muonic hydrogen exploiting the
corresponding measurements in electronic hydrogen. The proton structure
uncertainty in the calculation of contribution is sizably reduced.Comment: 5 pages, 4 figures, update in radiative corrections, the resulting
HFS is provided, version published in Eur. Phys. J. A 54: 3 (2018
Dispersion relation formalism for the two-photon exchange correction to elastic muon-proton scattering: elastic intermediate state
We evaluate the two-photon exchange correction to the unpolarized cross
section in the elastic muon-proton scattering within dispersion relations. One
of the six independent invariant amplitudes requires a subtraction. We fix the
subtraction function to the model estimate of the full two-photon exchange at
one of three MUSE beam energies and make a prediction for the two other
energies. Additionally, we present single and double polarization observables
accounting for the lepton mass.Comment: 16 pages, 9 figures, version published in Eur. Phys. J. C, 78 6
(2018) 51
Two-photon exchange correction to the Lamb shift and hyperfine splitting of S levels
We evaluate the two-photon exchange corrections to the Lamb shift and
hyperfine splitting of S states in electronic hydrogen relying on modern
experimental data and present the two-photon exchange on a neutron inside the
electronic and muonic atoms. These results are relevant for the precise
extraction of the isotope shift as well as in the analysis of the ground state
hyperfine splitting in usual and muonic hydrogen.Comment: 5 pages, 1 figure, version published in Eur. Phys. J. A 55; 64 (2019